complete the series with explanation..
1,6,21,42,69,____
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next one is 102
EXPLANATION
between 1 &6 there is a difference of 5 and between 6 &22 there is difference of 3times 5 and between 21&42there is a difference of 3times7and again between 42&69there is a difference of 3 time's 9 so it is clear that in next step there should be difference of 3timrs11 that is 33
so 69+33=102.
yashita2584:
thanks a lot
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