Question

how many multiples of 10 lie between 10 and 200​

Answer 1

Answer :

Multiples of 10 lie between 10 and 200 are in A.P.

20 , 30 , 40 , _ _ _ _ _ _ _ _ , 190

a = 20 , d = 10 , tn = 190

tn = a + ( n - 1 ) × d

190 = 20 + ( n - 1 ) × 10

190 = 20 + 10n - 10

190 = 20 - 10 + 10n

190 = 10 + 10n

10n = 190 - 10

10n = 180

n = 180/10

n = 18

Therefore

There are 18 multiples of 10 between 10 and 200.

Answer 2

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