Question

Find the sum of the first 25 multiples of 9
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Answer 1

Answer:

2925

Step-by-step explanation:

first term =9

common difference =9

no. of term =25

sum of n terms = n/2( 2a + (n-1)d

sum of 25 terms = 25/2 (2×9+(25-1)9)

= 2925

Answer 2

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4+8+12....100

4+8+12....100taking 4 common

4+8+12....100taking 4 common4(1+2+3+4....+25) = 4*325 =1300

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