Find the sum of first 7 number which are multiple of 2 as well as of 9
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Multiples of 2 and as well as 9
18,36,54,72,90,108,126
Sum of the first 7 multiples of 2 and as well as 9 is 504
Answered by
1
Answer:
S₁₇ = 504
Step-by-step explanation:
AP: 18, 36, 54......
a = 18
d= 36-18 = 18
n = 7
a₇ = 18+(7-1)(18)
= 18+108
= 126
a₇=126
S₇ = 7/2 [2(18) + (7-1)18]
= 7/2 X 2 [18+(6)9]
= 7[18+54]
= 7 x 72
S₇ = 504 → Ans..
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