Latest self Aptitude Question SOLUTION: 1,6,15,20,?,?,?

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(#M40008863) SELF question series Keep an EYE

1,6,15,20,?,?,?

vignesh waran A (12 years ago)

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Vignesh  (12 years ago)

Final Series = 1,6,15,20,29,34,43

It increases by +5, +9 alternatively.

1 +5 = 6
6 +9 = 15
15+5 = 20
20+9 = 29
29+5 = 34
34+9 = 43.

In other method,

It have two sequence,

1st seq = 1, 15, ??, ??
2nd seq = 6, 20, ??

Both the sequence increasing by +14.

Final Series = 1, 6, 15, 20, 29, 34, 43

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Pargat Pal Singh  (12 years ago)

In series
1,6,15,20,?,?,?
next number will be
1,6,15,20,15,6,1

first number is 1.
next 1*6/1= 6
6*5/2 = 15
15*4/3 =20

next 20*3/4= 15
15*2/5 =6
6*1/6 =1

Increasing the denominator of multiplier by 1 and decreasing numerator of multiplier by 1 starting from 6/1.

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