Here is a key board of a harmonium-This pattern of keys is repeated on larger keyboard- How many black keys would to on a keyboard with 14 such patterns-

Question

Toppr Admin · Accepted Answer

Black keys in 1 keyboard -7Black keys in 14 such keyboards -14-xD7-7-98 keys

Here is a key board of a harmonium:
This pattern of keys is repeated on larger keyboard. How many black keys would expect to find on a keyboard with $14$ such patterns.

Black keys in $1$ keyboard $= 7$
Black keys in $14$ such keyboards $= 14 \times 7 = 98$ keys

Here is a key board of a harmonium:This pattern of keys is repeated on larger keyboard. How many black keys would expect to find on a keyboard with 14 such patterns.

Black keys in 1 keyboard =7Black keys in 14 such keyboards =14×7=98 keys

Here is a key board of a harmonium:
This pattern of keys is repeated on larger keyboard. How many black keys would expect to find on a keyboard with $14$ such patterns.

Black keys in $1$ keyboard $= 7$
Black keys in $14$ such keyboards $= 14 \times 7 = 98$ keys