# What is the sum of all the numbers from 50 - 350 that are multiples of 6..and also write the 15th term

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The Brainliest Answer!

Multiplication of 6 are

54,60,66,72.......348

6(9,10,11.....57)

formala n(n+1)/2

57(58)/2 - 8(9)/2

54,60,66,72.......348

6(9,10,11.....57)

formala n(n+1)/2

57(58)/2 - 8(9)/2

multiples of 6

54, 60, 66, ......................,342,348

here,

a=54, l=328, d=6

n = (l-a)/d + 1

= (348-54)/6 + 1

= 294/6 +1

= 49 + 1 = 50

Sn = n/2(l+a)

= 50/2(328+54)

= 25 * 382 = 9550

Tn = a + (n-1) d

T15 = 54 + (15-1)6

= 54+14*6

= 54 +84

= 138