how many multiples of 9 lie between 70 and 700 find these sum of multiples of 9
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Answer: 21978
Step-by-step explanation:
Here series will we = 306, 315, 324 ,333 ,......693. So, we have the first term a =306 and d=9 and last term l= 693
693= 306 +(n-1)9
77= 34+(n-1)
n=77-34+1
= 44
sum=n/2 (a+1)
=44/2(306+693)
=22(999)
= 21978 answer
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