Question

Find the sum of the first 20 terms of the series given below: 8, 13, 20, 29, 40

Answer 1

Answer:

$\red { Sum \:of \: 10\: numbers } \green {= 545 }$

Step-by-step explanation:

Given series 8, 13 , 20, 29, 40

/* By observing the pattern of the series we conclude that if we add consecutive Odd to the preceding number to get the next number.

8, (8+5), (13+7),(20+9), (29+11),(40+13),(53+15),(68+17),(85+19),(104+21)

Ten terms in the series are 8,13,20,29,40,53,68,85,104 and 125

$Sum \: of \: 10 \:terms \\= 8+13+20+29+40+53+68+85+104+125\\= 545$

Therefore.,

$\red { Sum \:of \: 10\: numbers } \green {= 545 }$

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