5 20 12,15 40 4,4 ? 21-what will be in "?" sign?
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12 5 4..................
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60 will be the number between the series. The reason behind this is given below.
Step-by-step explanation:
The second number is 20 and it can be seen from the question. The fifth no. is 40 which is which is three times a head the second no. And the question mark is at seventh position which is three steps ahead the fifth number.
So, according to above data, the seventh question mark number is 60.
⇒ 40 = 20 + 20
⇒ 60 = 40 + 20
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