Question

1,3,3,7,6,13,10, ?,15,31,21​

Answer 1

Answer:

21

Step-by-step explanation:

1+2=3 3+3=6 6+4=10 10+5=15 15+6=21

and 3+(2×2)= 7 7+(3×2)=13 13+(4×2)=21

21+(5×2)=31

Answer 2

Answer:

The missing term is 21.

Step-by-step explanation:

The given series is 1, 3, 3, 7, 6, 13, 10, ?, 15, 31, 21.

We have to find the missing term.

The given series consists of two different series as follows:

• Series 1: 1, 3, 6, 10, 15, 21
• Series 2: 3, 7, 13, ?, 31

The logic behind series 1 is as follows:

1. First term = 1
2. Second term = First term + 2 = 1+2 = 3
3. Third term = Second term + 3 = 3+3 = 6
4. Fourth term = Third term + 4 = 6+4= 10
5. Fifth term = Fourth term + 5 = 10+5 = 15
6. Sixth term = Fifth term + 6 = 15+6 = 21

The logic behind series 2 is as follows:

1. First term = 3
2. Second term = First term + 4 = 3+4 = 7
3. Third term = Second term + 6 = 7+6 = 13
4. Fourth term = Third term + 8 = 13+8 = 21
5. Fifth term = Fourth term + 10 = 21+10 = 31

Therefore, the missing term is 21 and the complete series is 1, 3, 3, 7, 6, 13, 10, 21, 15, 31, 21.

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